how to fix P0174 code on my Toyota Tacoma N300 (2016-Present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before proceeding.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps
• Use a vacuum gauge to check for leaks in the intake manifold.
• Inspect all vacuum hoses for cracks or disconnections.
• Replace any damaged hoses and secure all connections with hose clamps.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, Torx screwdriver
• Remove the MAF sensor from the air intake tube using a Torx screwdriver.
• Spray MAF cleaner onto the sensor element; avoid touching the element with fingers.
• Allow it to dry completely before reinstalling.
• If the sensor is damaged, replace it with a new one.

4. Check and Replace Fuel Filter (if necessary)

• Tools Required: Fuel line disconnect tool, container for fuel
• Locate the fuel filter and relieve the fuel pressure by removing the fuel pump fuse and starting the car until it stalls.
• Use a fuel line disconnect tool to remove the fuel lines from the filter.
• Replace the old filter with a new one, ensuring proper orientation.
• Reconnect the fuel lines and reinstall the fuse.

5. Inspect Throttle Body

• Tools Required: Throttle body cleaner, screwdriver, rags
• Remove the air intake duct from the throttle body.
• Use throttle body cleaner to clean any carbon deposits inside the throttle body.
• Reinstall the air intake duct securely.

6. Test Fuel Injectors

• Tools Required: Fuel pressure gauge, multimeter (if testing electronically)
• Connect a fuel pressure gauge to the fuel rail to check for proper fuel pressure.
• If pressure is low, check the fuel pump and relay.
• If injectors are suspected to be faulty, perform an electrical test with a multimeter or replace them as needed.